初始化对象变量错误(Initialize object variable error)

初始化对象变量错误(Initialize object variable error)

编译以下代码时出错：

class TapeDeck { boolean canRecord = false; void playTape() { System.out.println("tape playing"); } void recordTape() { System.out.println("tape recording"); } } class TapeDeckTestDrive { public static void main(String [] args) { TapeDeck t; t.canRecord = true; t.playTape(); if(t.canRecord == true) { t.recordTape(); } } }

错误是：

TapeDeck.java:21: error: variable t might not have been initialized t.canRecord = true; ^ 1 error

如何在类中初始化变量t ？

I got an error compiling the following code:

class TapeDeck { boolean canRecord = false; void playTape() { System.out.println("tape playing"); } void recordTape() { System.out.println("tape recording"); } } class TapeDeckTestDrive { public static void main(String [] args) { TapeDeck t; t.canRecord = true; t.playTape(); if(t.canRecord == true) { t.recordTape(); } } }

The error is:

TapeDeck.java:21: error: variable t might not have been initialized t.canRecord = true; ^ 1 error

How shall I initialize the variable t in the class?

最满意答案

使用new关键字初始化对象。

TapeDeck t = new TapeDeck();

Use new keyword to initialize objects.

TapeDeck t = new TapeDeck();